It does not seem to work, I'm getting these errors:
L 05/24/2016 - 14:49:07: [ORPHEU] Function "PM_PlaySound" not found
L 05/24/2016 - 14:49:07: [AMXX] Displaying debug trace (plugin "test.amxx")
L 05/24/2016 - 14:49:07: [AMXX] Run time error 10: native error (native "OrpheuGetFunction")
L 05/24/2016 - 14:49:07: [AMXX] [0] test.sma::plugin_init (line 46)